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Stands for 'Orange Juice coming Out My Nose'.

When something is so suddenly funny that if you were drinking orange juice at the time, you'd probably choke on it and have orange juice coming out of your nose.
You: Dude, did you see john trip whilst walking, this morning?
Friend: Yeah man - that was so funny I had OJOMN!

On FB:
Person 1: I like to pick my nose and then massage the boogers on my anal orifice.
Person 2: Ha ha! OMG! OJOMN!
by Cnadz May 23, 2011
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